104 STAT. 2412 PUBLIC LAW 101-549—NOV. 15, 1990 transportation plans and programs be less frequent than every three years; and "(iii) address how conformity determinations will be made with respect to maintenance plans. "(C) Such procedures shall also include a requirement that each State shall submit to the Administrator and the Secretary of Transportation within 24 months of such date of enactment, a revision to its implementation plan that includes criteria and procedures for assessing the conformity of any plan, program, or project subject to the conformity requirements of this subsection.". SEC. 102. GENERAL PROVISIONS FOR NONATTAINMENT AREAS. (a) DEFINITIONS.— (1) Part D of title I of the Clean Air Act is amended by inserting immediately after "PART D—PLAN REQUIRE- MENTS FOR NoNATTAINMENT AREAS" the following: "Subpart 1—Nonattainment Areas in General "Sec. 171. Definitions. "Sec. 172. Nonattainment plan provisions. "Sec. 173. Permit requirements. "Sec. 174. Planning procedures. "Sec. 175. Environmental Protection Agency grants. "Sec. 176. Limitations on certain Federal assistance. "Sec. 177. New motor vehicle emission standards in nonattainment areas. "Sec. 178. Guidance documents.". (2) Section 171 of the Clean Air Act (42 U.S.C. 7501) is amended as follows: (A) In the introductory language, strike out "and section 110(a)(2)(I)". (B) Amend paragraph (1) to read as follows: "(1) REASONABLE FURTHER PROGRESS. —The term 'reasonable further progress' means such annual incremental reductions in emissions of the relevant air pollutant as are required by this part or may reasonably be required by the Administrator for the purpose of ensuring attainment of the applicable national ambient air quality standard by the applicable date.". (C) Amend paragraph (2) to read as follows: "(2) NONATTAINMENT AREA.— The term 'nonattainment area' means, for any air pollutant, an area which is designated 'nonattainment' with respect to that pollutant within the meaning of section 107(d).". (h) NONATTAINMENT PLAN PROVISIONS IN GENERAL. — Section 172 (42 U.S.C. 7502) of the Clean Air Act is amended to read as follows: " SEC. 172. NONATTAINMENT PLAN PROVISIONS IN GENERAL. "(a) CLASSIFICATIONS AND ATTAINMENT DATES. — "(1) CLASSIFICATIONS. —(A) On or after the date the Administrator promulgates the designation of an area as a nonattainment area pursuant to section 107(d) with respect to any national ambient air quality standard (or any revised standard, including a revision of any standard in effect on the date of the enactment of the Clean Air Act Amendments of 1990), the Administrator may classify the area for the purpose of applying an attainment date pursuant to paragraph (2), and for other purposes. In determining the appropriate classification, if any, for a nonattainment area, the Administrator may consider such factors as the severity of nonattainment in such area and the availability and feasibility of the pollution control measures
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